transfer: remove curl_upload_refill_watermark, no longer used

the define applied to upload buffers which we removed

Closes #13764

diff --git a/lib/transfer.c b/lib/transfer.c
index 7b3500d25dbb80f3ddd16db496dbd63f38be7b18..b0783581cc7992a78da5014a03a560ace693cd10 100644 (file)
--- a/lib/transfer.c
+++ b/lib/transfer.c
@@ -341,9 +341,6 @@ static void win_update_buffer_size(curl_socket_t sockfd)
 #define win_update_buffer_size(x)
 #endif
 
-#define curl_upload_refill_watermark(data) \
-        ((size_t)((data)->set.upload_buffer_size >> 5))
-
 /*
  * Send data to upload to the server, when the socket is writable.
  */